On my 4th and 5th tests, video bit rate went down however the 4th and 5th tests also varied in video bitrate reduction based on how much I stripped from the original MKV. In my first two tests where I changed nothing, video bitrate didn't go down. Thanks for the reply sneaker! Just so I understand better, the video track is separate from the audio and subtitle tracks in my example, correct? I guess what I'm still having trouble wrapping my head around is the fact that I'm not touching anything with the video track, so why should the bitrate go down? After muxing with mkvmerge the bitrate info can be more exact because it takes exact statistics and writes them as tags. For example if you have multiple variable bitrate tracks (in your case you have H.264 + Atmos). Often bitrate calculations are more estimates than perfect. The only way mkvmerge reduces video bitrate is by removing empty filler NALUs (which doesn't reduce quality whatsoever, they are fillers after all). I agree mostly with KarMa except that MediaInfo isn't perfect either. Why is the Video Quality decreasing if I'm not re-encoding anything? Any help is appreciated guys. So to sum it up, when I strip anything away, it seems the video bitrate is going down. Left all HDMV PGS and SRT subtitles, and the TrueHD Audio track. So I thought maybe the PGS Subtitles had something to do with it. Result: Smaller file size (expected), and smaller video bitrate (unexpected). Left only 2 HDMV PGS subtitles, and the TrueHD Audio track. Unchecked all foreign language subtitles. Great, so the Muxes were quick, and no file size or video quality was reduced. Last time for sanity check, didn't uncheck any boxes. Result: No change in file size or Video size ДЄgain, didn't uncheck any boxes. But the others, I had unexpected results, and here they are.Дidn't uncheck any boxes. I muxed it twice without changing any settings to make absolutely sure video quality or size would not decrease. MKV ToolNix 31.0.0 (Recently updated from 30.0.0) I was hoping that if I gave you guys enough details, you guys might have a couple answers/theories as to why the video bitrate goes down if I'm simply stripping unwanted audio and subtitles. I conducted about 5 experiments on the same file to test this out. But my tests, and a few other reports I've read on forums, leaves me with questions on this. I read that MKVToolNix doesn't do any encoding/re-encoding so, in theory, the video quality should not be affected. Step 3: Finally, hit the COMPRESS button and the MKV video will be compressed quickly. You can also change the format of the media file. Step 2: Once the file is added, you will get options to change the video resolution and size. I started noticing that when I organize my newly muxed MKVs (subtitles and audio stripped) in Plex, the video bitrate seems to go down. Or hit the + icon and locate your MKV file and then upload it to the website interface. I got MKVToolNix 31.0.0 thinking that I would be able to strip away subtitles and unwanted audio away from MKV files, without affecting video quality. Hey guys, I did a little reading on different forums and saw some posts from several years ago, but none with a definitive answer (maybe there isn't one?).

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